The Golden Triangle is a large, mountainous region of approximately 200,000 km2 (77,000 sq mi) in northeastern Myanmar, Northern Thailand and northern Laos, centered on the confluence of the Ruak and Mekong rivers. The name "Golden Triangle" was coined by Marshall Green, a U.S. State Department official, in 1971 in a press conference on the opium trade. Today, the Thai side of the river confluence, Sop Ruak, has become a tourist attraction, with the House of Opium Museum, a Hall of Opium, a Golden Triangle Park, and no opium cultivation.
The Golden Triangle has been one of the largest opium-producing areas of the world since the 1950s. Most of the world's heroin came from the Golden Triangle until the early 21st century when opium production in Afghanistan increased.